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eCommerce, price range controller

here’s the situation
I bought a service, which allows me to make a WordPress theme, getting a layout from WF, and convert it to a WP project.
only passed the course I understood that WebFlow eCommerce is much better, but only one thing I didn’t get how to do is product price range controller.
on my WF project, this thing is on the “catalog” page. Through the service, I made from this a working price range controller, what you can see here: (black bar with the handle, which allows you to choose the price range)
How to do this thing in WebFlow?

Here is my site Read-Only: